Property Value

You can also create a string representation of a DateTimeOffset object's millisecond component by calling the ToString method with the "fff" custom format specifier.

If you rely on properties such as Now or UtcNow to accurately track the number of elapsed milliseconds, the precision of the time's millisecond component depends on the resolution of the system clock. On Windows NT 3.5 and later, and Windows Vista operating systems, the clock's resolution is approximately 10-15 milliseconds.